Just found a couple of documents attached to the application to change the roof on the house, which was submitted at the end of BB14. It seems like they are 100% changing the roof but it also seems like they submitted an application to change the exterior layout to a BB8 style one.
Side view of changed roof.
Another view of roof and what seems like a new exterior.
There is also a letter confirming civilian BB is being cut back to 2 months long and that there is a gap between CBB16 and BB16.